Pressure head box for paper machines



Oct. 12, 1948. w. P. SHANNON PRESSURE HEAD BOX FOR PAPER MACHINES 3 Sheets-Sheet 1 Filed Sept. 12, 1945 .lllnflml M M -1 W %m 1| 7 mm WM, WIYMI and Waive; -M

Oct. 12, 1948. w. P. SHANNON PRESSURE HEAD BOX FOR P APER MACHINES Filed sa' t; 12, 1945 3 Sheets-Sheet 2 Inventor William 1. Shannon,

W. P. SHANNON PRESSURE HEAD BOX FOR PAPER ilACHINES On. I 12, 1948.

3 Sheets-Sheet 3 Filed Sept. 12, 1945 l/(f/E \\\N Inventor Uzi/lam f. 5/2072 nan,

eon/Wavy M 1 Patented Oct. 12, 1948 PRESSURE HEAD BOX FOR PAPER MACHINES William P. Shannon, Port St. Joe, Fla. Application September 1;, 1945, Serial No. 615,868

This invention relates to a pressure head box for paper machines, and more particularly to such a head box adapted to be used, with paper making machines of the Fourdrinier type.

A primary object of this invention isthe prosion of an improved headbox adapted to take the stool: from a mixing pump at any given consistency and feed the same from the headbox to a Fourdrinier screen traveling at given speeds in the form of a web or mat with a uniformity across the width of the screen.

An additional object 'of the invention is the provision of such a device provided with an adjustable lip and slice for regulating the thickness of the flow over the, complete width of the screen.

I scams. (or. 92-44) Still another object of the invention is the provision of such a device adapted to feed the mix under pressure by the means of a power driven helix through'a tortuous channel provided with baffles to. insure a thorough mixing and uniform flow prior to the ejection of the mix onto the Fourclrinier screen.

A further object of the invention is the provision of such. a pressure head provided with means whereby a relatively high pressure may be maintained therewithin, the pressure being uniform throughout the entire width of the head,

and provided with a plurality of pressure gauges whereby the pressure at various predetermined points may be readily determined in conjunction with the speed that the Fourdrinier screen is traveling,

Still other objects reside in the provision of such a device which will be sturdy and durable in construction, reliable and efiicient in operation, and relatively simple and inexpensive to manufacture, assemble and install, on any conventional paper machine of the Fourdrinier type.

Other objects reside in the combinations of elements, arrangements or" parts, and features of construction, all as will be more fully pointed out hereinafter and disclosed in the accompanying drawings wherein there is shown a preferred embodiment of this inventive concept.

In the drawings:

Figure 1 is a side elevational view, certain parts thereof being broken away, disclosing one form of pressure head embodying the concept.

Figure 2 is a top plan view of the device dis closed in Figure 1.

Figure 3 isa sectional view taken substantially along the line 3-3 ofFigure 1 as viewed in the direction indicated by the arrows.

2 Figure 4 is a sectional view taken substantially alon the line 4-4 of Figure 2 as viewed in the direction indicated by the arrows, and

Figure 5 is a sectional view taken substantially along the line 5--5 of Figure 1 as viewed in the direction indicated by the arrows. 1 Similar reference characters refer to similar parts throughout the several views of the drawings.

Having reference now to the drawings, and more particularly to Figure i, there is generally indicated at Ill a mixing pump adapted to mix the stock preparation with'water to obtain; a desired consistency-and pressure. From the mixing pump Iii a pressure-tube l 5 leads upwardly through a horizontal bend it up'and thence vertically through a section it to a horizontal portion It provided with a ate valve IE, to a vertical portion it which enters, through a sealed inlet i'l, into the end it of the pressure box,

generally indicated at it; Pressure gauges 2d and ii are provided in the horizontal portions i2 and id, respectively, onopposite sides of the gate valve is. 1

The end it of the pressure box it is provided with an end cap 22 secured thereto by bolts, and

has a centrally positioned aperture through which extends a shaft 23, a sealing gasket 2% beingheld,

in place by a threaded cap is"; to preclude passage 1 of fluid outwardly along the shaft (see Figure 4) The end of the shaft is outwardly of the box 99 is provided with a pulley 2d, driven by a belt 2i which, in turn, is driven by a pulley it mounted on the drive shaft 2% of a suitable electric motor as or similar source of power.

As best shown in Figure 4, the shaft 23 extends entirely through the pressure box it and' is journaled as in a bearing iii in a projecting portion 32 or the op'l Osite end Wall 33' or the box iii. A helix 34 extends about the shaft/23 within the box IQ for the purpose of feeding the mix from the inlet l1 longitudinally throughout; the length of the box.

As best shown in Figure 5 the box 19 is pro-"f vided in the base thereof'with a longitudinally extending outlet 35 which communicatesawith a tubular member 36 surroundingfthe box]! c'oaxially and provided interio'rly with af'pliirality instant inventive.

of longitudinally extending spaced bellies?1 311, cuate in cross section. The tubular chamber 36, in turn, communicatesthr'ough an outlet 38 with asecond tubular member 39' similarly provided with 'bafiles ill from which, in turn, an outletil leads to a plate 56 of non-corrosive material" commonly called 'an' apron board adapted for the pur oi keeping an even flow or the width of the sc n or Fourdrinier wire for the bottom of the outlet. 4

A plate 42 constructed of non-corrosive material commonly called a deckle is provided for the purpose of, keeping the flow of the mix oi! the edges of the screen or Fourdrinier wire.

A lip or slice .3 is pivotally secured as by pivot pins 44 to the outer tubular casing 39 adjacent and above the outlet H. The pivots 44 are suitably iournaled in projecting lugs 45 secured adjacentthe extremities oi the box.

As best shown in Figure the outer extremities of the slice 43 are provided with upstanding lugs 48 to which are pivotally secured, as by pivots 41. the extremities oi bolts." which pass through threaded apertures in protruding lugs 48 secured to the. outer portion oi tubular casing 3!. Nuts I serve to control the relative position of the bolts with respect to the lugs 49 and hence vary the relative height oi the opposite end of the slice 43. Additional bolts 5| pass through threaded apertures in lugs 52 secured at suitably spaced intervals to the outer wall of the tubular member 39 and the lower extremities of the screws ii are adapted to bear against intermediate portions of the slice in such manner as to exert a uniform pressure thereon, which may be adjusted at the will of the operator. Obviously, the relative position of the slice as adjusted by means oi the nuts 50 will determine the thickness 01' the mix fed over the deckle to the forming board.

As best shown in Figure 3, the forming board includes the customary breast roll 53 and a plurality of table rolls 54. The'entire assembly may be supported on legs 85 ofany desired height or configuration.

From the foregoing the operation of the device should now be readily understandable. A previously prepared mixed pulp including a requisite amount of water is passed from the mixing pump into the tubular passages II, I 2 and ii, at a greater pressure than is actually needed in order' to regulate the pressure box properly. As more pulp under pressure is needed in the pressure box it is admitted through the medium of the gate valve II and passes through the inlet l1 into the .box I! being fed therealong by the helix I. Obviously, the mixed pulp passes then through the outlet 35 into'th'e tubular member 38 being agitated by the baiiles 31 and thence through the outlet ll into the tubular members 39 and therearound emerging from the outlet 4i under the slice 43 and thence to the forming board and into the paper machine to be processed in the conventional manner.

From the foregoing it will now be seen that there is herein provided a device accomplishing all the objects of this invention and others, including many advantages of great practical utility and commercial importance,

As many embbdiments may be made of this inventive concept, and as many modifications may be made in the embodiment hereinbeiiore shown and described, it is to be understood that all matter herein is to be interpreted merely as illustrative and not in a limiting sense.

liclaimz.

l. A pressure head box for paper machines ineluding-a pressure chamber, a'cylindrical pressurehead tube, an inlet for paper mix through said pressure chamber, a cylindrical tube coaxial with said chamber, means including a longitudinally extending slot connecting said chamber and said tube, av second tube coaxial with said W drical first-mentioned cylindrical tube and having a longitudinal slot communicating therewith, an outlet for said last-mentioned tube comprising a longitudinal slot, and an adjustable slice adjacent said outlet.

2. A pressure head box for paper machines includiug a pressure chamber, a cylindrical pressure head tube,- an inlet for paper mix through said pressure chamber, a cylindrical tube coaxial with said chamber, means including a longitudinally extending slot connecting said chamber and said cylindrical tube. a second tube coaxial with said first-mentioned cylindrical tube and having a longitudinal slot communicating therewith, an outlet for said last-mentionedtube comprising a longitudinal slot, a ower driven feed helix in said box, and an adjustable slice adjacent said outlet.

' 3. A pressure head box for paper machines including a pressure chamber, a cylindrical pres sure head tube, aninlet for paper mix through said pressure chamber, a cylindrical tube coaxial with said chamber, means including a longitudinally extending slot connecting said chamber and said cylindrical tube, a second tube coaxial with said first-mentioned cylindrical tube andhaving a longitudinal slot communicating therewith, an outlet for said last-mentioned tube, comprising a longitudinal slot, a power driven teed helix in said box, an adjustable slice adjacent said outlet, and arcuate mixing baiiles in both of said tubes.

4. In a paper machine, a pressure head tube, a chamber extending transversely oi said tube,

means for supplying paper pulp to said chamber,

a helical conduit co-axial with said chamber, means connecting said chamber with one end of saidconduit and an adjustable slice connected with the other endoi said conduit.

5. In a paper machine, a pressure head tube, a chamber extending transversely of said tube,

means tor supplying paper pulp to said chamber,

a helical conduit co-axial with said chamber, means connecting said chamber with one end of said conduit and an adjustable slice connected with the other end of said conduit, said chamber having a power driven paper pulp feeding means therein.

6. In a paper machine, a pressure head tube, a chamber. extending transversely of said tube,

means for supplying aper pulp to said chamin said chamber, ower operated pressure means for delivering paper pulp from said chamber through said discharge slot, a spiral fin surrounding said chamber between said chamber and casing and forming a spiral delivery conduit communicating with said discharge slot, a longitudinal slot forming a discharge orifice from said conduit and an adjustable slice controlling the delivery from said orifice.

8. A pressure head device for a paper machine including a casing, a central chambertransverse said casing, means for feeding paper pulp axially into said chamber, a longitudinal discharge slot aid chamber, power operated pressure means nicating with said discharge slot, a longitudinal 5 slot forming a discharge orifice from said conduit and an adjustable slice controlling the delivery from said orifice, said flu having transversely extending mixing baflles on opposite sides thereof.

WIILIAM P. SHANNON.

REFERENCES crrEn' The following references are of record in the file of this patent: Y a

UNITED STATES PATENTS Number Number Name Date Case Dec. 18, 1906 Charlton Dec. 1, 1936 Serpas Dec. 9, 1941 lhorsen Sept. 21, 1943 FOREIGN PATENTS Country Date Italy May 17, 1932 

